摘要
随着裂缝型底水油藏的开发,底水水窜现象日益严重,导致油井普遍高含水低效生产。强非均质性是裂缝型底水油藏水窜的主要原因,明确底水水窜规律、探究底水油藏高效堵水调剖工艺是治理水窜的核心所在。文章在草古1潜山油藏地质特征的基础上,通过分析底水油藏水窜影响因素并优化堵水体系最佳注入段塞参数,为裂缝型底水油藏水窜治理提供理论依据。首先借助裂缝型底水油藏三维物理模型,探究了裂缝型底水油藏底水能量、井控裂缝位置及非均质性对水窜的具体影响作用机制;其次选取适用于草古1潜山油藏的耐温冻胶和纳米石墨强化泡沫体系开展段塞参数优化实验。研究结果表明,底水能量由1mL/min升至5mL/min,底水水锥倾角缩小24°,见水时机由0.20PV提前至0.11PV,同时采收率减小8.5%;裂缝位于直斜井跟端相较于位于趾端水锥倾角增大20°,见水时机延后0.06 PV,采收率升高7%;低渗透区由直斜井跟端移向趾端,水锥倾角增大25°,见水时机滞后0.09PV,采收率升高6.1%。最佳注入段塞组合为先注入纳米石墨强化泡沫后注耐温冻胶,最佳注入段塞用量为0.3PV油层,最优段塞注入速度为3mL/min,该段塞调剖方法相较于注入单一泡沫或冻胶,水锥倾角增大37~39°,见水时机延后0.09~0.17 PV,后续底水驱采收率提高5.0百分点~12.3百分点,为裂缝型底水油藏水窜治理提供了解决方案。
With the development of fractured bottom water reservoirs,the phenomenon of bottom water channeling is becoming more and more serious,resulting in high water cut and inefficient production of oil wells.Strong heterogeneity is the main reason for water channeling in fractured bottom water reservoirs,and the core of water channeling control is to clarify the law of bottom water channeling and explore the efficient water plugging and profile control process of bottom water reservoirs.Based on the geological characteristics of Caogu 1 buried hill reservoir,the influencing factors of water channeling in the bottom water reservoir was analyzed and the optimal injection slug plug parameters of the water plugging system was optimized,which provided a theoretical basis for the water channeling control of fractured bottom water reservoirs.Firstly,with the help of the self-developed three-dimensional visual physical model of fractured bottom water reservoirs,the specific influence mechanism of bottom water energy,well control fracture location and heterogeneity on water channeling in fractured bottom water reservoirs was explored.Secondly,the slug parameter optimization experiment was carried out by selecting the temperature-resistant gel and nano-graphite reinforced foam system suitable for Caogu 1 buried hill reservoir.The experimental results showed that the bottom water energy increased from 1 mL/min to 5 mL/min,the inclination angle of the bottom water cone was reduced by 24°,the water breakthrough time was advanced from 0.20 PV to 0.11 PV,and the recovery rate was reduced by 8.5%.The inclination angle of the water cone at the heel end of the straight inclined well increased by 20°compared with that at the toe end,the water discovery time was delayed by 0.06 PV,and the recovery rate increased by 7%.In the low permeability zone,the heel end of the straight inclined well moved to the toe end,the inclination angle of the water cone increased by 25°,the water breakthrough time lagged by 0.09 PV,and the recovery rate increased by 6.1%.it was determined that the optimal slug injection combination was as follows:nano-graphite reinforced foam was injected first and then temperature-resistant gel,the optimal injection amount of slug was 0.3 PV oil layer,and the optimal slug injection rate was 3 mL/min,compared with the injection of single foam or gel,the inclination angle of the water cone increased by 37—39°,the water breakthrough time was delayed by 0.09—0.17 PV,and the subsequent recovery degree of bottom water flooding increased by 5.0 percentage point—12.3 percentage point.It provides a solution for water channeling control in fractured bottom water reservoirs.
作者
张中涵
李琳
许德广
周杨
耿万磊
吕东方
赵光
ZHANG Zhonghan;LI Lin;XU Deguang;ZHOU Yang;GENGWanlei;LYU Dongfang;ZHAO Guang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,P R of China;Technology Research Institute of Xianhe Oil Production Plant,Shengli Oilfield Branch Company,Sinopec,Dongying,Shandong 257000,P R of China)
出处
《油田化学》
北大核心
2025年第3期465-473,共9页
Oilfield Chemistry
基金
中央高校基本科研业务费专项“油田化学与提高采收率”(项目编号23CX07003A)。
关键词
裂缝型油藏
底水油藏
水窜规律
调剖堵水
段塞组合
fractured reservoirs
bottom water reservoir
the law of water channeling
profile control and water blockage
slug combination
作者简介
张中涵(2000-),男,中国石油大学(华东)石油与天然气工程专业在读硕士研究生(2023-),从事油田化学与提高采收率应用基础研究,E-mail:2603018989@qq.com;通信联系人:赵光(1986-),男,教授,中国石油大学(华东)油气田开发工程专业博士(2016),从事油田化学与提高采收率相关研究,通信地址:266580山东省青岛市黄岛区长江西路66号中国石油大学(华东),E-mail:zhaoguang@upc.edu.cn。
